Where do you draw the line between coworkers having relationships within the workplace?

Have you ever been the new girl at work, trying to fit with everyone, and make new friends, only to find out they were all already friends and possibly more? Because I have. In less than a week working at this company I found out more people were dating each other, then not dating each other, this was very new to me but I went along with it anyway. My question is, is it okay to be dating someone you work with? Are there rules stating that you can or cannot date them?

- Caitlin

Credit to: http://www.welfareatwork.co.uk/images/11036.jpg for the photo